Realizing the necessity and the importance of a good Catholic education, the Pastor was most anxious to get Sisters for a Catholic school. On August 29, 1879, two Sisters, Sister Agatha and Sister Aurea of the Congregation of St. Agnes from Fond du Lac, Wisconsin, came to Herzog to share the poverty of these people and to teach their children. The parochial school in Ellis County opened in Herzog in September 1879. The church built by Hon. W. C. Maxwell served well the double purpose of church and school. Here the Sisters not only devoted their time to teaching religion and academic subjects but also the practical things of life as well. Progress was slow; attendance at times irregular and the fee of 50 cents per month per child was quite a burden for many to pay. Children knew they came to school to study, not to play. Strict discipline prevailed in school. Both English and German were taught in school and so was religion. In church, the Mass was said in Latin. Sermons, songs and congregational prayers in German. German was the language spoken in the homes of this German settlement.

The Sisters dwelt for a time in the Alois Dreiling house. When the new monastery was completed, the Sisters then lived in the old monastery. In 1888, the Pastor Father Anselm Beyerau, O.F.M.Cap. built a large four-room school which measured 66 x 30 x 23 feet northeast of the school; a home for the Sisters 36 x 26 x 18 feet was built. The Maxwells again contributed toward the building of this school and Sisters home.

The Sisters of St. Agnes continued to minister to this parish until the summer of 1989.